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1. Dark matter catalyzed baryon destruction

   https://doi.org/10.1103/PhysRevD.111.023005  

   Ema, Yohei; McGehee, Robert; Pospelov, Maxim; Ray, Anupam (January 2025, Physical Review D)

   WIMP-type dark matter may have additional interactions that break baryon number, leading to induced nucleon decays which are subject to direct experimental constraints from proton decay experiments. In this work, we analyze the possibility of continuous baryon destruction, deriving strong limits from the dark matter accumulating inside old neutron stars, as such a process leads to excess heat generation. We construct the simplest particle dark matter model that breaks the baryon and lepton numbers separately but conserves $B-L$. Virtual exchange by DM particles in this model results in dinucleon decay via $nn\to n\overline{\nu }$and $np\to n{e}^{+}$processes. Published by the American Physical Society2025 

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2. Beyond Hawking evaporation of black holes formed by dark matter in compact stars

   https://doi.org/10.1103/PhysRevD.111.L041306  

   Basumatary, Ujjwal; Raj, Nirmal; Ray, Anupam (February 2025, Physical Review D)

   The memory burden effect is an explicit resolution to the information paradox by which an evaporating black hole acquires quantum hair, which then suppresses its rate of mass loss with respect to the semiclassical Hawking rate. We show that this has significant implications for particle dark matter that captures in neutron stars and forms black holes that go on to consume the host star. In particular, we show that constraints on the nucleon scattering cross section and mass of spin-0 and spin- $1/2$dark matter would be extended by several orders of magnitude. Published by the American Physical Society2025 

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3. Search for dark matter annual modulation with DarkSide-50

   https://doi.org/10.1103/PhysRevD.110.102006  

   Agnes, P; Albuquerque, I_F M; Alexander, T; Alton, A K; Ave, M; Back, H O; Batignani, G; Biery, K; Bocci, V; Bonivento, W M; et al (November 2024, Physical Review D)

   Dark matter may induce an event in an Earth-based detector, and its event rate is predicted to show an annual modulation as a result of the Earth’s orbital motion around the Sun. We searched for this modulation signature using the ionization signal of the DarkSide-50 liquid argon time projection chamber. No significant signature compatible with dark matter is observed in the electron recoil equivalent energy range above $40{\mathrm{eV}}_{\mathrm{ee}}$, the lowest threshold ever achieved in such a search. Published by the American Physical Society2024 

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4. Cosmological constraints on dark neutrino towers

   https://doi.org/10.1103/PhysRevD.111.015024  

   Anchordoqui, Luis A; Antoniadis, Ignatios; Lüst, Dieter; Peñaló_Castillo, Karem (January 2025, Physical Review D)

   We reexamine a dynamical dark matter model with Kaluza-Klein (KK) towers of gravitons and neutrinos fitting together in the dark dimension. We show that even though gravitational decays of neutrino KK towers have little impact in cosmology, the weak decay channel could have significant cosmological effects. Taking conservative upper bounds on the dark matter decay rate into two photons before reionization and on the number of effective extra neutrino species $\mathrm{\Delta }{N}_{\mathrm{eff}}$, we derive constraints on the conversion rate from active to sterile species despite the dependence of the mixing angle on the KK mode mass. We also provide counterarguments to a recent claim suggesting that the bounds on $\mathrm{\Delta }{N}_{\mathrm{eff}}$rule out micron-sized extra dimensions. Published by the American Physical Society2025 

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5. Dynamical Explanation of the Dark Matter and Baryon Energy Density Coincidence

   https://doi.org/10.1103/PhysRevLett.132.201001  

   Brzeminski, Dawid; Hook, Anson (May 2024, Physical Review Letters)

   The near equality of the dark matter and baryon energy densities is a remarkable coincidence, especially when one realizes that the baryon mass is exponentially sensitive to UV parameters in the form of dimensional transmutation. We explore a new dynamical mechanism, where in the presence of an arbitrary number density of baryons and dark matter, a scalar adjusts the masses of dark matter and baryons until the two energy densities are comparable. In this manner, the coincidence is explained regardless of the microscopic identity of dark matter and how it was produced. This new scalar causes a variety of experimental effects such as a new force and a (dark) matter density-dependent proton mass. Published by the American Physical Society2024 

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